Siemens QPJ3125 125A 3P 240V Circuit Breaker, Plug-On | AmpState

Designed for reliable circuit protection in panelboards, load centers, and electrical distribution systems, the Siemens QPJ3125 125A 3P 240V Plug-On Circuit Breaker is a practical choice for retrofit work and maintenance when the part number must stay consistent.

With a plug-on connection, installation is straightforward—you simply mount it onto the compatible bus and secure the breaker's trip unit, minimizing downtime during replacements or upgrades. This 3-pole, 240V unit handles up to 125 amps across a three-phase circuit, delivering dependable protection for commercial and light-industrial environments where power distribution matters most.

Key advantages

• Plug-On installation for fast, tool-light mounting on compatible Siemens panelboards and load centers.
• 125 A, 3-pole, 240 V configuration designed for three-phase distribution and feeder protection.
• Consistent part number QPJ3125 supports retrofit planning, spare parts stocking, and maintenance scheduling.
• Siemens reliability with a trusted, industry-standard solution within the Siemens QPJ family.
• AmpState availability — ships this exact part and can assist with compatibility confirmation.

Specifications

• Manufacturer: Siemens
• Part Number: QPJ3125
• Product Type: Circuit Breaker
• Amperage: 125 A
• Poles: 3
• Voltage: 240 V
• Design: Plug-On
• Availability: AmpState

Ideal use cases

• Retrofit projects in panelboards and load centers where the existing part number must be maintained for quick ordering and compatibility.
• Maintenance planning for facilities with three-phase 240V distribution needing reliable protection and minimal downtime.
• New installations in commercial spaces that require a proven Siemens solution for three-phase circuits.

Need help matching a part number or confirming compatibility? Message AmpState and we’ll help you verify fit before you buy.